This bug is created as a clone of upstream ticket:
https://fedorahosted.org/bind-dyndb-ldap/ticket/120
With development of DNSSEC feature (#56), it becomes clear that persistent search will be mandatory. All other mechanisms should be removed in that time.
In order to allow transition period, we need to clearly notify users that all other synchronization mechanisms are now (in Fedora 19) deprecated - via doc changes and warnings to /var/log/messages.